Malotru is hostage to Daech, and the DGSE tries to get him out of this hell with the help of Nadia and his Syrian contacts. The CIA is not enthusiastic about seeing the hostage come back and the potential scandal of its betrayal. Marina, traumatized by her detention in Iran, is devastated by paranoia ...

As negotiations begin between the DGSE and Daech, via Nadia, Malotru sees a glimmer of hope: one of his jailers is a mole of the Russian secret services and can help. Duflot tries to help Marina overcome her trauma.

The FSB agent likely to help Malotru is wounded in battle, and Malotru loses hope. Marina is approached by Philippe, a man who claims to belong to the DGSE. He wants to recruit her on behalf of Mossad.

A senior Daech officer, Cochise, takes advantage of the Malotru video to make the DGSE understand that he wants to defect. The Russian agent returns and intends to obey the instructions of the FSB: let Malotru languish in his cell. Philippe 'trains' Marina, whom he takes for a novice, and asks him to go and give a lecture in Baku.

Malotru and the Russian struggle for survival in hostile terrain while they are actively hunted by jihadists. Duflot is preparing to go on the ground, in Syria, to meet Cochise. It is for him the only chance to get Malotru out of Daech's hell. As for Marie-Jeanne, she replaces Duflot at the head of the Bureau.

Malotru can only rely on himself and must fight alone to hope to escape his pursuers. Duflot, who had just left office at the head of the Bureau, went to meet Cochise on the banks of the Euphrates. In Baku, Marina is offered a post at the Institute of Seismology.

In Baku, Marina is caught up in paranoia, which complicates her mission. During an interview under high tension, Duflot meets Cochise and negotiates his defection, on condition that Malotru be released...

The DGSE lives in dark hours, and Marie-Jeanne is on the front line to stay the course. The director-general decides to carry out an operation to free Malotru while exfiltering Cochise. In Baku, Marina realizes the mission entrusted to her by the Mossad and implants a computer virus...

The Bureau is putting all its resources to find Malotru. Nadia and Prune are put to work on this mission, but Malotru, as a professional, is extremely cautious. In Baku, the wind turns for Marina: Philippe realises that she is perhaps not as novice as she claims...

Marina is sequestered by Philippe, and the Mossad is ready to get rid of her; she must get out of there. At the same time, at the DGSE, Marie-Jeanne is more determined than ever to stop Malotru during a secret meeting of the latter with Nadia...